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 Form 1 Chemistry Topical Questions and Answers on Air and Combustion

In an experiment a certain volume of air was passed repeatedly from syringe to over heated excess zinc powder as shown in the diagram below.
The experiment was repeated using excess magnesium powder. In which of two experiments was the change in the volume of air greatest? Give reasons.

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Answer Text:
The volume change was greatest when magnesium is used. This is because zinc only reacts with the oxygen part of air while magnesium reacts with both oxygen and nitrogen.